* WebControls.csproj:
* Estimate.aspx: UserName input control
* IValueProvider.cs:
* TemplateException.cs:
* ResultPages.cs: code cleanning
* WorkFlowController.cs: Admin now can register new users
* LocalizedText.resx:
* LocalizedText.Designer.cs: new registration messages
* RegisterModel.cs: The registration message contains the user
validation decision